public inbox for [email protected]
 help / color / mirror / Atom feed
From: Steven Rostedt <[email protected]>
To: Stefan Metzmacher <[email protected]>
Cc: Ingo Molnar <[email protected]>,
	[email protected],
	io-uring <[email protected]>
Subject: Re: Tracing busy processes/threads freezes/stalls the whole machine
Date: Tue, 4 May 2021 09:32:43 -0400	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On Tue, 4 May 2021 15:28:12 +0200
Stefan Metzmacher <[email protected]> wrote:

> Am 04.05.21 um 15:24 schrieb Steven Rostedt:
> > On Thu, 22 Apr 2021 16:26:57 +0200
> > Stefan Metzmacher <[email protected]> wrote:
> >   
> >> Hi Steven, hi Ingo,
> >>  
> > 
> > Sorry, somehow I missed this.
> >   
> >> # But
> >> # trace-cmd record -e all -P 7  
> > 
> > I'm curious. 
> > 
> > What is the clock set to? What does:
> > 
> >  # trace-cmd list -C
> > 
> > show?  
> 
> On both machine (physical and VM):
> trace-cmd list -C
> [local] global counter uptime perf mono mono_raw boot x86-tsc
> 
> Thanks for looking at it!

Bah, I was hoping it would show "[global]" as we just discovered a bug
because the global clock took a spin lock and a recent change allowed it to
recurse once (causing a deadlock if it happened). But the "[local]" clock
has no such issue. Which means I need to do a bit more digging into this
cause :-(

-- Steve


  reply	other threads:[~2021-05-04 13:32 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22 14:26 Tracing busy processes/threads freezes/stalls the whole machine Stefan Metzmacher
2021-04-22 14:55 ` Stefan Metzmacher
2021-05-04 12:26 ` Stefan Metzmacher
2021-05-04 13:24 ` Steven Rostedt
2021-05-04 13:28   ` Stefan Metzmacher
2021-05-04 13:32     ` Steven Rostedt [this message]
2021-05-04 13:35     ` Steven Rostedt
2021-05-05  9:50       ` Stefan Metzmacher
2021-05-31 15:39         ` Stefan Metzmacher
2021-07-19 17:07           ` Stefan Metzmacher
2021-07-22 22:43             ` sched_waking vs. set_event_pid crash (Re: Tracing busy processes/threads freezes/stalls the whole machine) Stefan Metzmacher
2021-07-23  1:41               ` Steven Rostedt
2021-07-23  2:51               ` Steven Rostedt
2021-07-23 10:35                 ` Stefan Metzmacher
2021-07-23 11:29                   ` Steven Rostedt
2021-07-23 11:53                     ` Stefan Metzmacher
2021-07-23 12:41                       ` Steven Rostedt

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox